What does it mean for a difference in means to be "statistically significant at the 0.05 level?"O The difference in means is exciting, worthwhile and/or noteworthyThe difference in means is only interesting to about five percent (or less) of AmericansThere's less than a five percent chance of seeing a difference of that magnitude due entirely to chance (.e., sampling error)Tom is 95 percent sure that he would rather be taking a nap than writing this exam

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MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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2.1 About what percent of x values lie between the mean and one standard deviation to the right of the mean? About ____ % Answer as a whole number.
1. The mean score and the standard deviation in the Statistics test are respectively equal to 80 and 2.5, whereas in the Mathematics test the mean score is 70 and the standard deviation is 2. If Liza got a score of 75 in Mathematics in which subject is her standing better assuming normality in both subjects? 2. The results of a nationwide aptitude test in Mathematics are normally distributed with mean = 63 and standard deviation = 5. What is the 97.5th percentile?
Suppose you got a P-value of 0.023. Would this be statistically significant at the 0.05 level? Would it be statistically significant at the 0.01 level?
IQ scores have a bell-shaped (mound shaped) distribution with a mean of 100 and a standard deviation of 10. Using the Empirical Rule, answer the following questions. a. What percentage of IQ scores are between 70 and 130? b. What percentage of IQ scores are less than 100? c. What percentage of IQ scores are between 90 and 110?
Below is the complete question for (e). At the 5% significance level, there is not / is enough evidence to reject / support the claim that the mean monthly residential electricity consumption in a certain region is different from / is greater than / is less than ____ kWh.
Suppose that mean retail price per gallon of regular grade gasoline is $3.50 with a standard deviation of $0.10 and that the retail price per gallon has a bell-shaped distribution. NOTE: Please use empirical rule approximations for this problem. a. What percentage of regular grade gasoline sells for between $3.40 and $3.60 per gallon (to 1 decimal)? b. What percentage of regular grade gasoline sells for between $3.40 and $3.70 per gallon (to 1 decimal)? c. What percentage of regular grade gasoline sells for more than $3.70 per gallon (to 1 decimal)?
% of all data lies within one standard deviation to the left of mean % of all data lies with two standard deviation to the right of mean
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8. Formulating directional and nondirectional hypotheses The body mass index (BMI) of a person is the person’s weight divided by the square of his or her height. It is an indirect measure of the person’s body fat and an indicator of obesity. Results from surveys conducted by the Centers for Disease Control and Prevention (CDC) showed that the estimated mean BMI for US adults increased from 25.0 in the 1960–1962 period to 28.1 in the 1999–2002 period. [Source: Ogden, C., et al. (2004). Mean body weight, height, and body mass index, United States 1960–2002. Advance Data from Vital and Health Statistics, No. 347.] Suppose you are a health researcher. You conduct a hypothesis test to determine whether the mean BMI of US adults in the current year is lower than the mean BMI of US adults in 2000. Assume that the mean BMI of US adults in 2000 was 28.1 (the population mean). You obtain a sample of BMI measurements of 1,034 US adults, which yields a sample mean of M = 28.9. Let μ denote…
A survey of 100 senior citizens was undertaken and it was found that 9 of them had the flu vaccine this year. Do these data suggest that the proportion of senior citizens who get the flu vaccine is significantly less than 12 %? Test at a = 0.10. Round your answers to three decimal places, and round any interim calculations to four decimal places. What is the test statistic? Hint: Make sure you are rounding your answer to three decimal places.
Test the claim that there is correlation between CPI and Cost of Pizza with ? = 0.05. CPI 30.2 48.3 112.3 162.2 191.9 197.8 Cost of Pizza 0.15 0.35 1.00 1.25 1.75 2.00

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